@article{AFST_2015_6_24_3_625_0,
     author = {Weisheng Wu},
     title = {On the ergodicity of geodesic flows on surfaces of nonpositive curvature},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {625--639},
     publisher = {Universit\'e Paul Sabatier, Institut de Math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 24},
     number = {3},
     year = {2015},
     doi = {10.5802/afst.1457},
     mrnumber = {3403734},
     language = {en},
     url = {https://afst.centre-mersenne.org/articles/10.5802/afst.1457/}
}